Shield foe metal rolls



2 Sheets-Sheet 1.

(N0 Model.)

H. MGDGNALD. I

SHIELD FOR METAL ROLLS.

No. 268,259. Patented Nov. 28, 1882l N4 Pinna Phulqullrogvaplwr,washington D4 C.

2 'Sheets-Sheet 2.

(No Model.)

H. MGDONALD.

SHIELD POR METAL ROLLS.

No. 268,259. Patented Nov. 28, 1882.

UNITED STATES PATENT CF1-nen.

HUGH MCDONALD, OF ALLEGHENY, PENNSYLVANIA.r

SHIELD FOR METAL ROLLS.

SPECIFICATION forming part of Letters Patent No. 268,259, dated November28, 1882, Application filed May 28, 1880. (No model.)

Q0 all whom it may concern: Be it known that I, HUGH MoDoNALD, otAllegheny, county of Allegheny, State of Pennsylvania, have invented ordiscovered a new and useiul Improvement in Shields for Metal Rolls; andI do hereby declare the following to be a full, clear, concise, andexact description thereof, reference being had to the accompanyingdrawings, making a part of this specification, in whichlike lettersindicating like parts- Figure l, Sheet l, is a perspective view of apair of rolls fromthe front orA feeding side, and with mypresentimprovements applied thereto, but with a part ot' the exteriorcaseof the shield broken away. Fig. 2, Sheet 2, is a view in elevationon the rear or delivery side, and Fig.3 is a transverse vertical sectionin the plane of the line .fr .fr of Fig. 2.

Much personal discomfort, as is well known, is experienced by workmen inconnection with the working of highly-heated metals, both iu the furnaceand in the rolls, and this discomfort`is so great as sometimes todisable the workman, particularlyin hot weather, and also tends tointerfere with or prevent that degree ot' exactness or precision indoing the work which is essential to the best results. Shields forfurnaces have been devised; but so far as I am aware roll-shields areentirely new.

By my present invention I combine with a pair of metal rolls, such asare in ordinary use for the rolling of heated metals, a movable shieldor barrier so proportioned in breadth relatively to the length of theworking-faces of or the working-points on the rolls that the workmanbyadjusting it one Way or the other at pleasure may uncover a portion ofsuch working-face or one or more of such workingpoints, and at the sametime may secure for himself a considerable degree of protection asagainst the excessive heat to which he would otherwise be subject; and lalso make such a shield ot' such superiorconstrnction as best to adaptit to the end in view. And while my present improvements are adapted foruse on or in connection with any form, construction, or style of rollsfor workin g or reducing heated metals by the rolling operation, andhavingi two or more working-points or lines of feed, I have, forconvenience of illustration, shown them in the drawings as combined witha pair of grooved breaking-down rolls, A A, which are mounted inanysuitable housings, A.

A shield particularly adapted for use on the feeding side of the rollsis shown at B. As represented, it consists of a hollow water-box madesubstantially as described in patent granted to me April 6, 1880, No.226,181, and is supported by like hangers (t and frictionrollers a ou araised track, c2, which is snpported by posts a, attached to thehousings. The shield has such breadth less than the length of theworking-faces of the rolls as may be desired with reference to givingthe workman the desired amount or degree of protection, and bypreference extends up or nearly up to or a little above the height ofhis head, and downward about to or a little below the plane of feed orpart of the rolls. By the' means above designatedthe shield is renderedmovable or adjustable along in front of the rolls, so that the rollermay standin front of the shield and feed the bar, billet, pile, or bloominto the desired pair of grooves, and when on the next or somesubsequent pass he has to change his position, so as to cause the bar,billet, 85o., to en ter a groove farther along, he can at thesame timeshift the position of the shield accordingly; also, the shield should beproportioned in its width and adjustments so that it may uncover any oneofthe grooves in the rolls through which a pass is to be made. Thehollow water-shield l believe to be the best for the purpose, and anysuitable watersupply may be provded'for the purpose-as,

for example, a water-pipe, b, discharging directly into the upper openend of the shield, as in the patent above referred to, and the surplusWater or overflow may be led off through a pipe, b', which, in thevarying positions of the shield, may discharge into a trough, b2, fromwhich a pipe or pipes, b3, may discharge onto the boxes or bearings ofthe rolls to keep them from being overheated; or the water may beotherwise led off for any useful purpose; but where it is desired toapply cold water directly to the rolls the trough may be arrangeddirectly over the rolls, with jet holes or pipes in its bottom, arrangedat suitable intervals for discharging the water onto the rolls; butother means may be employed for supplying and discharging water, sincein these respects I do not limit myselfin my invention to any ICOparticular means. In fact, as hereinafter stated, the water may beentirely dispensed with.

In connection with this shield B, I have also shown means for supplyingcold air in jets to the workman while occupying his usual position,substantially as set forth in the patent above referred to. Such meansconsist of an air-chamber, D, inclosed in the water-space of the shield,supplied with air under pressure through a pipe, d, and dischargingtheair, after being cooled by the water which surrounds D, through pipes dd2 and jet-pipes d3. This feature may be used or not, at pleasure. Outhe other side of therolls, which is the delivery side, or the side onwhich the catcherstands, a similarly-made shield may be used, providedthe catcher can be relied on to see that at all' times it is shifted outofthe way of the throughcoming bar, billet, &c.; but in order to avoidthis risk I have thought best to make the upper part of the shield R onthis side stationary and extending along the entire length of the rolls,with its upper edge at about the same height as before, and with itslower edge at such height as will notinterfere with the passing back ofthe bar, billet, &c., over the top of the upper roll. This part It ofthe shield differs in no respect from that already described, except inshape and in the fact that it is not movable. It may be supplied withwater in like manner, and the pipes n a provvide for carrying off theoverow to the boxes. If desired, the air-chamber D, with itsconnections, yas already described, may be added, the same beinglettered, as already set forth. Parallel with ihelower edge of this partR of the shield, and in close proximityv thereto, is a vtrack rail orrod, e, on which is hung the other part, R', of the compound shield, butin such manner as to be movable or adjustable along on the rod e. Thewidth of this (which I term an apron-shield) and the rule for itsadjustment are substantially as above set forth with reference to theshield B. As shown, it consists of a single metallic plate; but it mayhave the water-box or other desired construction 5 butin order that nodamage may be done in case itis not at any time so adjusted as to be outof the way of the through-coming bar, billet, &c., I prefer to unite theapron-shield R to its rod or track e by a hinge or other equivalentconnection, so that in the case supposed it may readily swing out of theway. The principal protection thus secured to the roller and catcherarises as follows: Drafts of air caused by the wind or otherwise andheated by the hot bar, billet, &c., instead of passing from the rolleror feeding side to the catcher or from the catcher side to the rollerwill loe caught by the protecting-shield of the roller or catcher, asthe case may be, and be deflected or turned upward between the shieldsand pass oft' above the headsof the workmen. In fact, so much of theheated air as comes between the two shields will have a draft upwardinstead of being radiated out horizontally to the roller and catcherpositions; or, if only one shield is used, the workman standing by theside of it will thereby be protected as against heat, which wouldotherwise be radiated from back of it, as also against drafts orcurrents of heated air coming from the other side of the rolls; and alsothe shield B on the rollers side will protect him as weli against hotscale, cinder, sparks, the., which are thrown back in the rollingoperation.

In so far as relates to the general combination of a protecting shieldor barrier with a pair of rolls I do not limit myself to any particularconstruction or form of.shield or mode of hanging or connecting thesame, since useful results may be secured by the use of otherv knownforms of shields, such as a plate or sheet of metal with or withoutfibrous or plastic facing on one or both sides, or a waterspray, or suchas a double plate with any suitable interposed lining or filling, oreven with only an air-space between the plates. `Some such shields arealready known in the art, and to some others I lay claim in otherapplications already filed or to be tiled. Nor do I limit myseltl to thecombination of a shield with only a single pair ot' rolls, since Iinclude within the term pair of rolls7 a set of rolls such as areemployed in a three-high or fourhigh mill, or suoli as are in common usein a universal mill. A single pair of rolls forms a part of a set in allsuch mills. l

I claim herein as my inventionl. In combination with a pair of metalworking or reducing rolls, an apron-shield, R', suspended between therolls and the ordinary position ofthe catcher on the delivery side, andfree to swing outward in case it is engaged by the through-goingbar,substantially as set forth.

2. ln combination with a pair of rolls having each a series of operativerolling parts or faces, a roll-shield, B, of known suitable material,made less in width than the length of the rolls and adjustable in thedirection of the length of the rolls, whereby the workman may cover oruncover at pleasure different parts of the operative rollin g-surfaces,substantially as and for the purposes set forth.

3. In combination with a pair of rolls, a compound shield, R It', ofsuitable known material, of which the upper part, It, xed in position,shall extend downward to a little above the level of the top of theupper roll, and the other part, R', shall be movable at pleasure in thedirection of the length of the rolls, substantially as set forth.

4. In combination with a pairof rolls, a movable shield, B, on one sideof the rolls and a compound shield, R R', on the other side,substantially as set forth.

In testimony whereof I have hereunto set my hand.

HUGH MGDONALD.

Witnesses:

R. H. WHrrrrLnsEY, C. L. PARKER.

IIO

IIS

